The US Department of Transportation gave TransAir approval to begin domestic and international passenger and cargo charter flights. The airline purchased N413JG (c/n 23148, l/n 1059), a 737-2Q8/Adv in July 2015, and applied for charter approval a year ago. In the above photo taken today, this 737 is seen on the TransAir ramp, and not anther hangar. No word was given as to when charter flights will begin.
Further information in this CH-Aviation article.